Exhibit 12.1

Calculation of Ratio of Earnings to Fixed Charges



|                                                      |  |                                                           |       |      |   |       |  |      |        |      |   |        |  |   |       
|----------------------------------------------------- |  | --------------------------------------------------------- | ----- | ---- | - | ----- |  | ---- | ------ | ---- | - | ------ |  | - | ------
|                                                      |  | Year Ended December 31,                                  
|                                                      |  | 2001                                                      |       | 2002 |   | 2003  |  | 2004 |        | 2005
|                                                      |  | (In thousands, except ratio of earnings to fixed charges)
|Income from continuing operations before income taxes |  | $                                                         | 4,837 |      | $ | 4,132 |  | $    | 17,288 |      | $ | 43,919 |  | $ | 73,230
|Fixed charges(1)                                      |  |                                                           |       |      |   |       |  |      |        |      |   |        |  |   |       
|Interest expense                                      |  |                                                           | 26    |      |   | 102   |  |      | 32     |      |   | 1,661  |  |   | 5,934 
|Amortization of debt issuance cost                    |  |                                                           |      |      |   |      |  |      |       |      |   | 253    |  |   | 3,318 
|Interest included in rental expense                   |  |                                                           | 264   |      |   | 365   |  |      | 350    |      |   | 425    |  |   | 632   
|Total fixed charges                                   |  | $                                                         | 290   |      | $ | 467   |  | $    | 382    |      | $ | 2,339  |  | $ | 9,884 
|                                                      |  |                                                           |       |      |   |       |  |      |        |      |   |        |  |   |       
|Earnings(2)                                           |  | $                                                         | 5,127 |      | $ | 4,599 |  | $    | 17,670 |      | $ | 46,258 |  | $ | 83,114
|Ratio of earnings to fixed charges                    |  |                                                           | 17.7  |      |   | 9.8   |  |      | 46.3   |      |   | 19.8   |  |   | 8.4   

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|(1) | Fixed charges consist of interest expense on indebtedness, amortization of debt issuance costs and the estimated portion of rental expense deemed a reasonable
approximation of this interest factor.
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|(2) | Earnings consist of income from continuing operations before income taxes plus fixed charges.
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